Heeling-machine



.I. F. STANDISH.

HEELING MACHINE.

APPLICATION FILED MAR. 1B. 1918.

5 SHEETS-SHEET l- J. F. STANDISH.

HEELING MACHINE.

APPLICA'HON FILED MAR. I8, 1918.

1,384,700 Patented July 19, 1921.,

5 SHEETS-SHEET 2- J. F. STANDISH.

HEELING MACHINE- APPLICATION FILED MAR. 18, I918.

.1, 4 7 Patented July 19, 19215 5 SHEETS-SHEET 3- Q. I l 2:: m:

2 a VZ/WJAY. l flnmmlmuk My J. F. STANDISH.

HEELING MACHINE.

APPLICATION FILED MAR. 18, 1918.

Patented July 19, 19219 '5 SHEETS-SHEET J. F. STANDISH.

HEELING MACHINE.

APPLICATION FILED MAR. 18, 1918.

Patented July 119 1921.

5 SHEETSSHEET 5- rric.

JOHN F. STANDISH, OF WINTHROIE, lLCASSACI-IUSETTS, ASSIGNOB, TO UNITEDSHOE MACHINERY CORPORATION, OF EATERSON, NEW JERSEY, A CORPORATION OFNEW JERSEY.

HEELING-IVIACHINE.

i senate.

Specification of Letters Patent.

Patented July 19, 1921..

To all whom it may concern Be it known that 1, Joan F. STANDISH, acitizen of the United States, residing at VVinthrop, in the county ofSuffolk and State of Massachusetts, have invented certain Iniprovcmentsin lleeling-lilachines, of which the following desorption in connectionwith the accompanying drawings, is a specification, like referencecharacters on the drawings indicating like parts in the several figures.

This invention relates to heeling machines one is directed moreparticularly to improvements in the pressure mechanism of machines ofthe type illustrated by Letters Patent No. SSshlii, granted April 14,1908, upon the application of Benjamin F. Mayo, although it will beapparent that various features of the invention are not limited in theirutility to embodiment in this particular type of machine but are equallyappliable to hecling machines of other types.

The general object of the invention is to improve and simplify theconstruction of healing machines in such respects as to permit them tobe run very rapidly with a minimum of shock and wear upon the parts andat the same time to produce work of the highest quality.

The machine disclosed in the Mayo patent .aboi'e referred to has beenvery successful,

connnercially, and many hundreds of them are in use in shoe factories.In that maohine. however, the pressure applied to the workbehirc andduring the driving of the attachin nails is transmitted through heavyspring at the sides of the machine. This pressure increases in apredetermined ratio as the nails are being driven, and the mode ofapplication of the pressure cannot be alto, suit the requirements ofvarious i-lasscs of work. Consequently, the pressure is applied inexactly the same way whether the heels are high or low or whether theyare soft or hard.

cstnother ditiiculty which has been encountered in the use of themachine referred to occurs when the pressure is being. released from theshoe. heavilv (OHlPIQSSGll during thenail driving operation, and as soonas the crank has passed dead center the springs expand very suddenly,causing the crank shaft to run The side springs are very ahead of thebalance wheel, this being possible by reason of the fact that thedriving power is transmitted from the balance wheel to the crank shaftthrough a Horton clutch. This sudden movement causes considerable shockto the machine, frequently sufficient to interfere with the properworking of the nail distributer and sometimes even sufficient to throwthe top lift out of the top lift holder. Furthermore, it is necessary touse a very powerful brake on the crank shaft to insure that it shallstop at the right point. This brake, being applied continuously, absorbsa great deal of power and its parts wear away rapidly.

With these conditions in view, an important feature of the presentinvention consists in the elimination from the pressure mechanism of alieeling machine of the usual springs and the provision of pressuretransmitting means, preferably frictionally operated, which will notcause a rebound when the driving crank passes its dead center point.With this arrangement, the pressure may be applied in the same way as inthe earlier machine, but. released more gradually, with the consequentelimination of the objectionable shock, and means, constituting afurther feature of the invention, may be associated with the frictionpressure applying mechanism for permitting preliminary adjustments todetermine how the pressure shall be applied. lf'a preferred form of theinvention, provision is made for either applying the pressure in aprogressively increasing degree as the nails are driven, or, as isdesirable in some classes of work, applying initially practically theentire amount of pressure and then maintaining the pressuresubstantially constant throughout the nail driving operation. Thisresult may be advantageously accomplished by the provision of means forprogressively increasing the friction in the pressure transmittingdevices, constructed and arranged for adjustment to vary the rapiditywith whichthe friction is increased, or even to maintain the frictionconstant throughout the period of pressure application. This means mayconveniently take the form of a cam arranged to control the frictionalmechanism, and, preferably, adjustable to cause an increase in thefriction in said mechanism or to causeit to remain constant while thepressure is being applied to the work. The frictional power transmittingconnections or devices may in clude a friction drum and a bandsurroundmg and bearing uponthe drum, the arrangement being such that thead ustable cam previously referred to, operates tocontral:

the pressure of the band upon'the drum. One end of the band may beanchored, while the other is yieldingly drawn in the direction ofrotation of the drum when applying 'ing pressure to the work may thus betransmitted whlle an undue absorption of power 7 and wearing of theparts is avoided in the idle return stroke.

In accordance witha further feature of the invention, the frictioncontrolling cam may be thrown out of operation entirely,.the band 1 uponthe friction drum being solely under the influence of a spring, thetension of which may be adjusted, but which is normally constant in theoperation of the machine. In this connection an important featureconsists in the particular arrangementof the friction band in itsrelation to the drum. One end of the band is anchored at a point whichis stationary relatively to the axis of the drum while the other end issecured under tension in a yielding manner, with the result thatrotation of the drum in one direction'tends to draw the band closelyinto engagement with it, producing a substantial degree of friction,while reverse rotation of the drum causes the other end of the band'toyield and the amount of friction to be reduced.

A still'further feature of the invention consists in the provision ofautomatic means for ad ustably determining the initial relaously in theholes in the nailing die, and this 7 adjustment provides for varying thedepth of the holesto suit nails of different lengths without varying theamount of the nail which shall be left projecting from. the

heel when the heelis attached. I have met 7 this condition by providingadjustable stops for variably limiting the return movement of the die,1n combination wlth a lost motion connection between the drivers and thedie,

so constructedand arranged that the actuation of the drivers may bepositive, but the die is permitted to stop at any desired point in itsreturn stroke.

In another of its aspects, the invention relates to the provision ofimproved means for controlling the relative approach of the jack andnailing die of a heeling'machine in the successive operations ofattaching a heel to a shoe and applying a top lift to the attached heel.In the machine of the Mayo patent previously referred to, the thicknessof the top lift and the so-called spanking plate upon which it issupported, is compensated for by automatically operated toggle mechanismwhich is shown and described in de tail in Letters Patent No. 446,383,granted Feb. 10, 1891, upon the application of C. IV. Glidden and A. D.Elliott. Inthat machine, the shifting of the toggle at the back of themachine to compensate for the top lift and spanking plate is effectedautomatically upon the downward movement ofthenailing die and driversand operates upon the jack and its supporting mechanism. The parts whichare moved are quite heavy, and the sudden movement in shifting the jackfrom heel attaching to top lift spanking position, or vice versa, jarsthe entiremachine to an objectionable extent. A feature of the presentinvention consists in the provision of means for eliminating the suddenmovement of these heavy masses of metal with the consequent vibration orjarring of the machine, and the entire compensating mechanism is greatlysimplified in operation and cheapened' in cost of construction- In acvcordance with this feature of the invention, the pressure applyingmember which is moved to compensate for the thickness of the top liftand spanking plate-in the present example the nailing diehas imparted toit a movement to oneextent for applying pressure to the work duringtheheel attaching operation and to another extent for ap plying thepressure during the top lift spanking operation. This'inember may bedriven by power means having an invariable stroke with the provision ofautomatic mechanism interposed between the power means and thepressnre'applying member for varying the amount of movement of the saidmember. In the. embodiment of the invention hereinafter described andillustrated in the acocmpanying drawings, a lost motion connection isprovided between the driver toggle and the nailing die in combinationwith means for eliminating the lost motion in alternate cycles ofoperation. This lastmentioned means may convenientlyjconsist of anoscillatingpressure supporting member having steps of different heightand operated by a cam upon'one of the toggle members. In thisconnectioma further fea ture of the invention consists in the proingmechanism out of action, and giving the pressure applying members auniform stroke for every operation when it is desired to use the machlnefor surface nailing.

These and other features of the invention will best be understood fromthe following detailed description of one embodiment thereof to be readin connection with the accompanying drawings, in which Figure 1 is aview in side elevation of a hceling machine embodying the invention;

Fig. 2 is a front elevation of the machine shown in Fig. 1;

Fig. 3- is a vertical, sectional view of the compensating mechanism;

Fig. el is a view in side elevatiom showing particularly the frictionalpower transmit-- ting connections in the pressure mechanism.

Figs. 5, G and '7 are perspective views of details of the compensatingmechanism;

Figs. 8 and 9 are views in side elevation of the compensating mechanismshowing it in the two extreme positions assumed during the heelattaching operation; and

Figs. 10 and 11 are similar views of the same mechanism in thecorresponding positions assumed in the top lift spanking operation.

In the drawings 10 indicates the frame of a heeling Ineachine and 12indicates the jacl: or shoe support which is normally stationaryvertically, but, may be adjusted in accordance withthe thickness of theworn to he operated upon.

Power is furnished to the machine by a continuously running balance wheewhich is connected through the usual onerevolution Horton clutch withthe crank shaft 16. The cranl shaft is connected by a connecting rod 18to the center of a toggle comprising a linlr 20 pivoted at 22 to themachine frame. and a link 2%. pivoted at 26 to a spindle 28 whichcarries. at its upper end. a gang of nail drivers 30.

The nailing die is mounted in a die support 31- rigidly connected to theupper ends of a pair of upr' t rods The rods 36 are guidec for verticalmovement in sleeves 38. the upper ends of which are secured by clampingmembers :0 to the driver head .2 carried at the upper end of the die bedspindle 28. llacl: teeth ell are formed in the rods 36 and punons iiinesh ingwith the racl: teeth are formed-upon shafts 4:8 to each of whichis keyed a friction drum 50.

inasmuch as the two sides of the p essure applying mechanism aresymmetrical with respect to each other. it will be sailicient todescribe one of them in detail. flhe lower end of the rod 36 is reduced.as shown at and passes through a guiding bushing l. which is treaded topermit vertical adjustment in a bracket 56 secured to the machine frameby bolts 58. A set screw 60 is provided for securing the bushing inadjusted position. A washer 62 of yielding shock absorbing materialsurrounds the reduced portion of the rod, resting against the shoulderformed at the junction of the main portion 36 of the rod and its reducedportion 52.

The friction drum 50 is provided with flanges 6% for the purpose ofmaintaining in proper relation to the drum a friction hand 66, one endof which is anchored on a pin 68 mounted in a bracket '70, bolted to, orformed integrally with the sleevecasting 38. The anchor pin 68 locatedbeneath, and substantially in vertical alinement with, the axis of thefriction drum. The friction band 66 is lined with leather or othersuitable friction material 72 and partially encircles the drum, engagingits periphery.

A bell crank lever 74 is pivoted at T6 to the rear end of the bracket70, and a rod '78 attached to the free end of the friction band 66passes loosely through a hole in the end of a forwardly extending arm 80of the lever. A compression spring 82 surrounds the lower end of the rod78 and the ends of the spring bear respectively against the end of thearm 80 and nut 8% threaded upon the lower end of the rod 78, byadjustment of which th tension of the spring may be varied. The end of ascrew 86 passing through the lever arm 80 bears againstthe friction bandwhere the latter surrounds the anchor pin 68. and this screw may beadjusted to Vary the limit of upward in rement of the arm.

The second arm 88 of the bell cranl: lever 74 extends downwardly and aroll 90 is mounted in its lower end. The roll is arranged to engage anadjustable cam. comprising a plate. 92 secured to the machine frame byscrews 9% passing through slots 96 in the plate. and an angularlyadjustable cam member 98 pivoted to the plate 92 by a screw 100 andsecured in adjusted position by a belt 102 passing througl a slot l0l inthe member 98 and threaded into the plate 92. It will be apparent thatthis construction provides for bodily adjustment of the entire camstructure vertically and inde pendent angular adjustment of the cammember 98 about the pivot 100. straight vertical surface, to be eng d bythe roll 90, is formed upon the rear lace of the; cam plate 92 and acorresponding cam surface 108 is formed upon the rear face of the cammember 98. The lower end of the member 98 is formed as a pointer 110.cooperating w'th a graduated scale 112. the purose of which is tofacilitate a like adjustn the cam members 98 upon the two sides of themachine. in order that the two friction bands 66 may be operatedsimultaneously in exactly the same way.

The mechanism for compensating for the thickness of the top lift andspanking plate will now be described, after which the operation of themachine will be described in proper sequence. As already stated, theconent of necting rod 18, which transmits motion from the crank shaft 16to the toggle 20, 24, has an invariable movement and is connected to thecenter pivot 114 of the toggle. A rocker member 116 is rigidly securedto a rock shaft 1-18 by a pin 120 (see Fig. 5). The rock shaft 118 ismounted for oscillatory movement in the upper toggle link 24. A curvedpressure supporting surface or step 122 is formed upon the rocker member116, being arranged to engage a complemental curved surface 124 upon thelower face of a yoke 126, having a tongue and groove connection 128, byvirtue of which the yoke is permitted to slide longitudinally in theupper end of the link 24. The curved surface 124 is formed on aninwardly extending portion 130,

I which also has formed in its upper face an extended bearing for theupper toggle pivot '26 (see Fig. By this arrangement a solid train ofconnections is secured for transmitting the necessarily great force tothe nailing die and drivers;

A spring pressed plunger 132, located in a recess in the member 116 andbearing upon a rearwardly extending bracket 134 formed as a part of thetoggle link 24 tends always to swing the member 116 forwardlyinto theposition illustrated in Figs. 3, 4, 8' and 9. This is the positionoccupied by the parts during the operation ofdriving the nails to attachthe heel to the shoe.

A screw 136 having its upper face curved to correspond to the surface122 is threaded into the member 116, as shown clearly in Fig. 5.The-member 116 is splita-nd provided with a clamping bolt 138 forsecuring the screw 136 immovably in 'position when the desired verticalad ustment of the screw has been secured. The function of the screw 136is to transmit the working pressure when the top lift is being attachedto the heel,fand it is normally so adjusted that its curved face isbelow the surface 122 by a distance equal tothe thickness of the topliftand the spanking plate interposed between the nail ing die and the heel.During the top lift spanking operation, the rocker member 116 occupiesthe angular position relativel to the toggle link 24, shown in. Figs. 10a'nc 11. By virtue of a lost motion connection consiting of slots 146 inthe upper end of the link '24 where the pin 26 passes through it, thepressure transmitting screw or step 136 is permitted to rise from theposition shown in Fi 10 to that shown in Fig. 11 where the top of thescrew engages and transmits pres- I sure to the member 136. ltwill beobserved that the member 136, which is movable v loosely for a shortdistance vertically, acts member 116 from one position to the other thefollowing mechanism is provided. A collar 142 is rigidly secured to therock shaft 118, and the outer end of the shaft is re duced to form atrunnion for a hub 144 carrying an arm 146 provided at its outer endwith a roll 148. Tongues 150formed on the end of the hub 144 arearranged to enter slots 154, in the collar 142. A spring 158 located ina recess in the hub and held in position by a washer 160 and nut 162upon the end of the rocker shaft 118 tends to hold the hub in lookingengagement with the collar, but permits the hub to be drawn out wardlyand turned upon the shaft 118 into a different angular relation to theshaft, where the tongues 150 may enterthe slots 154 and lock the arm 146in an inoperative position.

A cam member 164, having-three identical cam faces 166, is formed on theface of a disk 168 which is journaled to rotate on the end of thecenter-toggle pin 114. Ratchet recesses 170 are formed in-the innerfaceof the disk 168 and spring pressed pawls 1'72, 17 4 mounted respectivelyin the toggle links 24, 20 are arranged to engage in the recesses torotate the disk and'cam relatively to the pin 114 when the toggle linksare moved angularly relatively to each other. The spring pressed plunger132 keeps the roll 148 in engagement with thecam 164 and it will thus beapparent that the cam constitutes controlling means for determiningwhich of V the steps 122, 136 shall be in pressure transmitting relationto the member 130.

The operation of the above described ma chine is as follows: Assumingthe machine to be in the position'of rest, as illustrated in Figs. 1 and2, with the rocker member 116 in the position shown in Fig. 8, a load ofshaft executes one revolution. Inasmuch as the stopping position of thecrank 18 practically upon its rear dead center point, the first half ofits revolution produces forward movementof the connecting rod 18 untilthe toggle 26, 24 is straightened. Assuming the position shown in Figs.4 and 9, inasmuch as the high step 122 is under the pin 26, the

lost motion connection 140 is inoperative upon this stroke and thespindle 28 is given a positive upward movement throughout the entireperiod of the forward stroke of the connecting rod. The cam 98 may be soadjusted that the roll 90' is initially in engagement with, thestraightawayportion of the plate 92, and the nut 84 adjusted to producesufficient tension upon the spring 82 to draw the friction band 66 intoengagement with the drum. 50, producing enough friction between the bandand the drum to prevent r0 neeasvo tation of the drum until the nailingdie encounters resistance to its upward movement. Under theseconditions, the spindle 28 and driver head 42 will carry the side rods36 and nailing die 32 upwardly until the heel upon the nailing dieengages the shoe. At this point, the resistance of the shoe and heel tofurther upward movement of the nailing die will tend to cause thefriction drum to be rotated by relative movement of the rack a4. andpinion 46. Such rotation of the friction drum will be resisted by thefriction band 66 to an extent dependent upon the tension of the spring82 and sutficiently to exert pressure upon the work dur ing thecontinued upward movement of the spindle 28.

At about the time when the heel engages the shoe, the roll 90 will beginto ride rear \vardly upon the inclined cam face 108, therebyprogressively increasing the fric tion of the band 66 upon the drum 50during the further upward movement of the spindle and consequentlyincreasing progressively the pressure applied to the work while thenails are being driven. WVhen the resistance to the movement of thenailing die becomes sufficient, the drum 50 will slip in the band, andthe drivers 30 will move upwardly through the nailing die, driving theattaching nails through the heel into the shoe.

As the connecting rod 18 starts upon its rearward stroke, the toggle 20,24 is broken and the spindle 28 moves downwardly. The initial portion ofthis downward movement releases the pressure from the work and isunresisted until the washers 62 engage the upper ends of the bushings54:, whereupon downward movement of the rods 36 and the nailing-diesupported thereby is stopped and the continued descent of the spindle 28with the driver head 42 and sleeves 38 carried thereby, will produce areverse rotation of the friction drum 50 in a clockwise direction,

as viewed in Fig. 4. Prior to the engage ment of the washer 62 with thebushing 54, the roll 90 arrives upon the stra htaway portion of theplate 92, materially diminishing the tension upon the spring 82.Furthermore, the spring 82 is quite light and yields readily, with theresult that frictional resistance to the rotation of the drum 50 in thedirection in which it is moving at this time is very small. Thus anunnecessary absorption of power in restoring the parts to their initialpositions is avoided.

During the breaking of the toggle 20, 2 1 and the downward movement ofthe spindle 28, the pawl 17% operates to rotate the disk 168 from theposition shown in Figs. 8 and 9 to that shown in Figs. 10 and. 11, theroll 14:8 riding up on the face 166. The arm 146 is thus actuatedautomatically to swing the rocker member 116 from heel attaching to toplift attaching position, with the step 136 in alinement with the member130.

In the next cycle of operation of the machine, the initial portionof theforward movement of the connecting rod 18 will be ineffective until thelost motion permitted by the slot 140 is taken up, and the step 136engagesthe surface 124. In this cycle of the operation of the machine,therefore, the extent of upward movement of the spindle 28 will be lessthan that in the heel attaching operation by an amount equal to thedifference in the heights of the twosteps 122 and 136,that is to say, byan amount sufficient to compensate for the added thickness of the toplift and spanking plate, introduced between the heel and the nailing dieprior to the starting of the machine for the top lift spankingoperation;

It will be apparent from the preceding detailed description of themechanism of the machine that provision is made for adjustably varyingthe operation of the machine to suit all classes of work. By verticaladjustment of the cam plate 92, the point in the nail driving operationat which the roll 90 begins to ride upon the inclined cam face 108 maybe varied to cause the progressive increase of pressure upon the work tobegin at any desired time, and the swinging adjustment of the cam member98 about the pivot 100 permits the rate of the progressive increase ofthe friction between the drum 50 and the band 66, and consequently therate of progressive increase of pressure upon the work, to be varied, asdesired. On the other hand, in some classes of work it may be desired toapply a certain amount of pressure to the work and to maintain thatpressure constant throughout the nail driving operation. Under theseconditions, the cam member 98 may be swung to the left, as seen in Fig.1, until its face 108 is practically a continuation of the straightawayface of the plate 92, whereupon the friction inthe power transmittingconnections will remain constant throughout the stroke of the spindle 28but may be adjusted by turning the nut 84 to change the tension of thespring 82. If it be desired to produce greater fric- -tion than can besecured by adjustment of the nut 84 the screw 86 may be turned throughthe arm until the roll 90 is lifted away from its cam, whereupon aconstant amount of friction will exist between the drum and band duringthe upward stroke. The amount of this friction, however, will be verymuch less on the return stroke by reason of the yielding of the spring82, as previously described. p

The operation of the machine has been described above as it foccurs whenattaching first a heel and then a top lift in so-called blind nailedwork. In surface nailed work, however, the heel and top lift or the heelwith the top lift previously attached to it is attached to the shoe by asingle nailing with a single stroke of the spindle 28, and under. thesecircumstances alternate'move ments of the nailing die to differentextents are not desired. To meet this condition, it is merely necessaryto draw the hub 144 outwardly against the tension of the spring 158,turn it angularly forward until the tongues 150- 'are 7 in alinementwith the grooves 154;, and release it, whereupon the arm 146' will belocked in an inoperative position in which the roll 148 will not beengaged by the cam 166. The spring pressed plunger 182' will nowmaintain the rocker member 116' continuously in heel attaching relationto the toggle, andvthe operation of the machine will proceed as with asimple toggle, a uniform stroke being imparted to the spindle 28 insuccessive cycles of operation.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States is 1. In a heelingmachine, the combination of a work engaging member, power operated meansfor actuating the said member,-yielding power transmitting connectionsbetween the actuating meansand the member, and means for preliminarilyadjusting the connections to transmit thepre'ssure in a variable mannerduring the application thereof.

2. In aheeling machine,,the combination of a work' engaging member,power operated means for actuating said member to apply pressure tothe'work, yielding power transmitting connections between the actuatingmeans and the member, and preliminarily adjustable means for varyingduring the apyielding connections.

3; In a heeling machine, the combination. a with a work engaging member,power means for actuating said member to apply pressure to the work,yielding friction power trans- 'means for actuating said member,frictional power transmitting connections between the actuating meansand the member, and means for lnsuring a progressive increase of thefriction insaid connections while the pressure is being applied to thework.

5. Ina heeling machine, the combination of a" work enga m'ng. member,power operated means for actuating said member to apply plication ofpressure the resistance of said:

pressure to the work, frictional power transmitting connections betweenthe actuating means and. the member, and controlling mechanism for thefrictional means preliminarily adjustable at the will of the operator tocause the friction to be progressively increased or to remain constant,as desired, during the application of pressure to the worln 6, In aheeling machine, the combination of a work engaging member, poweroperated means for'actuating said member to apply pressure to the work,yielding power transmitting connections between the actuating means and.the member and controlling mechanism preliminarily adjustable at thewill of the operator to modify the action of said yielding connectionsto cause the pressure either to be progressively increased or to remainconstant throughout the period of its'application to the work. I 7, In aheeling machine, the combination of a. work engaging member, means formoving. said member. to apply pressure to the work, and frictional powertransmitting mechanism between said means and member embodying afriction drum, a band bearing upon said drum, and means for keeping theband under tension.

7 8. In a heeling'macine, the/combination of a work engaging member,means for moving said member to apply pressure to the. work, andfrictional power transmitting mechanism between said means and memberembodying a friction drum, a bandbearing upon said drum, and meansacting in the operation of the machine for varying the pressure withwhichrthe band bears upon the drum. Y

9. In a heeling machine, the combination of a work engaging member,means for moving'saidmember to apply pressure to the work, andfrictional power transmitting connections between said means and memberincluding anfriction drum, a b'and'bearing uponssaid drum and means forincreasing the pressure of the band-upon the drum during: "the,application of work.

pressure to the V 10. In a heeling machine,the combination ofaworklengaging member, means for mov- 7 rssaevo 1:2. In a heelingmachine, the combination of a work engaging member, means for movingsaid member to apply pressure to the work, pressure transmittingconnection between said means and member, including a friction device,and an adjustable cam for variably controlling the operation of thefriction device.

13. In a heeling machine, the combination of a work engaging member,means for moving said member to apply pressure to the work, and powertransmitting connections between said means and member including afriction device movable in two directions and constructed and arrangedto operate with greater iriction when moving in one direction than whenmoving in the other direction. Y

14-. In pressure mechanism for heeling machines, the combination of apressure member arranged for cooperation with the work, and operatingconnections therefor in-- cluding a rotatable, reversible friction drum,and a friction band partially surrounding and bearing upon the drum, oneend of the band being anchored at a point which is stationary relativelyto the axis of the drum, and the other end of the band being heldyieldingly under tension, whereby greater friction is exerted upon thedrum during its rotation in one direction than during its rotation inthe opposite direction.

15. In pressure mechanism for heeling in achines,the combination of apressure member arranged for cooperation with the work. and operatingconnections therefor, including a rotatable, reversible friction drum, afriction band partially surrounding and bearing upon the drum, one endof the band being anchored at a point which is stationary relatively tothe axis of the drum, a spring connected to the other end of the bandand arranged to draw the band 1nto engagement with the drum and meansfor varying the tension of the spring.

16. In a heeling machine, the combination of a nailing die,reciprocating nail drivers, means for advancing the drivers and die, andautomatic means for variably limiting the return stroke of the diewithout affecting the stroke of the drivers.

17. In a heeling machine, the combination of a nailing die,reciprocating nail drivers, means for advancing the drivers to a. fixed,predetermined limit and the die through a less distance, said advancingmeans acting also to withdraw the drivers and die, and means forvariably limiting the return stroke of the die.

18. In a heeling machine, the combination of a nailing die,reciprocating nail drivers, means for advancing the drivers to drivenails, a lost motion connection between the drivers and the die, anadjustable stop for variably predetermining the limit of the returnstroke of the die, and means for setting the stop'in the operation ofthe machine.

19. In a heeling machine, the combination of a reciprocable nailing die,a reciprocating driver spindle, a gang of nail drivers mounted upon thespindle, power means for ad vancing the spindle to drive nails, lostmotion connections between the spindle and the die arranged to move saiddie in opposite directions, and an adjustable stop for variably limitingthe return stroke of the die.

20. In a heeling machine, the combination of a driver supporting head, agang of nail drivers carried by the head, power means for advancing thehead and drivers to drive nails, an upright sleeve rigidly secured tothe head, areciprocable guide rod within the sleeve, :1 nailing diesupported by the guide rod, and an adjustable bushing surrounding theguide rod beneath the sleeve, said bushing being in position to beengager by the rod to limit the return stroke thereof.

21. In a heeling machine, he combination of a stationary work engagingmember, a movable member for engaging and exerting pressure upon thework, power means having an invariable stroke for actuating the movablemember, automatically acting mech anism for varying the limit of theadvancing movement of the movable member, and means for rendering saidautomatically acting mechanism inoperative.

22. In a heeling machine, the combination of relatively movable workengaging and pressing members, power means having an invariable strokefor actuating one of said pressing members, automatically actingmechanism for varying the limit of the advancing movement of saidmember, and means for rendering said automatically acting mechanisminoperative.

23. In a heeling machine, the combination of a jack, a nailing die,means for advancing the nailing die toward the ack to exert pressureupon the work, controlling mechanism acting automatically to cause thenailing die to be advanced alternately to greater and less distancesfrom the jack in successive cycles of operation oi the machine and meansfor rendering said controlling mechanism inoperative.

24. In a heeling machine, the combination of a jack, a nailing die,toggle mechanism for moving the nailing die toward the ack to exertpressure on the work, and means acting automatically to transmitalternately greater and less amounts of the movement of said togglemechanism to the nailing die in successive cycles of operation of themachine.

25. In a heeling machine, the combination of a jack, a nailing die,toggle mechanism for moving the nailing die toward the jack to applypressure to the work, and automatic means controlled by the movement ofthe toggle for causing alternately greater and less proportions of thethrow of the toggle to be transmitted to the nailing die.

26. In a hecling machine, the combination of a jack, a nailing die,toggle'mechanism for effecting relative approaching movement of thenailing die and the jack to apply pressure to the WOIk and automaticmeans carried bythe toggle for causing alternately greater and lessproportions of the throw of the toggle to be transmitted to the die insuccessive cycles of operation of the machine.

27. In pressure mechanism for hceling machines, the combination of anailing die, means for supporting the die, toggle mechanism foradvancing the die and die support, and a rocker member mounted in onelink of the toggle, said rocker member having steps of different heightsalternatively movable into position to transmit the movement of thetoggle to the die support.

28. In pressure mechanism for heeling machines, the combination of anailing die, toggle mechanism for advancing the die to apply pressure tothe Work, a member carried by the toggle and having steps of differentheights movable alternatively into position to transmit the movement ofthe toggle to the die, automatic means for offecting said movement ofsaid member, and

means for rendering said automatic means inoperative.

29. In pressure mechanism for heeling machines, a pressure toggleembodying a rocker member having pressure transmitting portions ofdifferent heights, cam mechanism for moving said pressure transmittingportions alternatively into operative position and ratchet mechanismoperated by relative movement of the toggle links for actuating said cammechanism.

30. In a heeling machine, the combination of a nailing die, togglemechanism for advancing the die to apply pressure tothe Work, a lostmotion connection between the toggle and the nailing die, and means foreliminating the lost motion in alternate cycles of operation of themachine.

In testimony whereof- I have signed my specification.

name to this JOHN F. STANDISH.

